Mr Law, 60, a father-of-four from Wirral, Merseyside, launched legal action against the Trust in March last year. Compensation has still to be agreed.
He told the Guardian: “The renal unit (at the Royal Liverpool) says my kidney is working well. However, I am still feeling the effects from the chemotherapy and medications which I now take.
“Over the last 15 months I have suffered in many ways, physically and mentally, including weight gain, muscle wastage and depression.”
Mother-of-two Mrs Smart, 47, from St Helens, Merseyside, said: “I felt devastated to learn that I had received a kidney infected with cancer. The result has been psychologically and physically draining.
“Before the chemo and everything I was dress size 12, now I am a 22. My hair has grown back brunette, I was blonde before.”
Ms Hamlyn, of NHSBT, said the cause of the mistake was human error which was “dreadful for all concerned”.
She added: “I do not underestimate how traumatic this has been for those involved but lessons have been learned through an extensive investigation and a number of changes to working practices have been implemented to help prevent any such event happening again."